The Mackie Thump 15A / 15BST Speaker Bag is designed to preserve and protect your loudspeaker from the rigors of on-the-road wear and tear. The outer material is made from 600D polyester fabric with a water-resistant polyurethane coating. Internally, the case uses polyethylene boards on the bottom and sides to provide a stiff, protective structure. The interior also features a layer of foam covered by knitted fabric to provide cushioning from knocks and bumps with protection for the speaker's finish. Other notable features include an outside cable pouch with a hook-and-loop fastener, heavy duty zippers, and comfortable padded webbing on the handles, located on the side of the bag.